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  • J. Yan, A. Ahmad
  • Computer Science
  • ACM Conference on Computer and Communications…
  • 2008 (First Publication: 27 October 2008)
  • CAPTCHA is now almost a standard security technology. The most widely deployed CAPTCHAs are text-based schemes, which typically require users to solve a text recognition task. The state of the art ofExpand
  • H. Gao, J. Yan, +7 authors J. Li
  • Computer Science
  • NDSS
  • 2016 (First Publication: 22 February 2016)
  • Text-based Captchas have been widely deployed across the Internet to defend against undesirable or malicious bot programs. Many attacks have been proposed; these fine prior art advanced theExpand